$ man patchadd
...
     -R client_root_path

         Locates all patch files generated by patchadd under  the
         directory   client_root_path.  client_root_path  is  the
         directory that contains the bootable root  of  a  client
         from  the server's perspective. Specify client_root_path
         as the absolute path name to the beginning of the direc-
         tory  tree  under  which  all  patch  files generated by
         patchadd are to be located. -R cannot be specified  with
         the -S option. See NOTES.
...